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Employee Benefits - Summary of Workers' Compensation Known Claims and IBNR Reserves (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Employee-related Liabilities [Abstract]    
Included in other current liabilities $ 4,913 $ 4,595
Included in other long-term liabilities 8,837 7,052
Workers' Compensation Liability $ 13,750 $ 11,647